Return-Path: Delivered-To: apmail-incubator-cassandra-user-archive@minotaur.apache.org Received: (qmail 6930 invoked from network); 7 Dec 2009 13:32:33 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 7 Dec 2009 13:32:33 -0000 Received: (qmail 30023 invoked by uid 500); 7 Dec 2009 13:32:32 -0000 Delivered-To: apmail-incubator-cassandra-user-archive@incubator.apache.org Received: (qmail 30004 invoked by uid 500); 7 Dec 2009 13:32:32 -0000 Mailing-List: contact cassandra-user-help@incubator.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: cassandra-user@incubator.apache.org Delivered-To: mailing list cassandra-user@incubator.apache.org Received: (qmail 29995 invoked by uid 99); 7 Dec 2009 13:32:32 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 07 Dec 2009 13:32:32 +0000 X-ASF-Spam-Status: No, hits=-2.6 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of jbellis@gmail.com designates 209.85.219.220 as permitted sender) Received: from [209.85.219.220] (HELO mail-ew0-f220.google.com) (209.85.219.220) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 07 Dec 2009 13:32:30 +0000 Received: by ewy20 with SMTP id 20so3234922ewy.0 for ; Mon, 07 Dec 2009 05:32:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :from:date:message-id:subject:to:content-type :content-transfer-encoding; bh=iTPY0gv7oa3TbWFPGULl74aQyPCnHdeC8wk2V/Rj6iQ=; b=Nwz3vzhzBfK8jynkwiZYoK7OjVVP8LTTfks+3ZW5Ex/bdai6CP+jX7CToZrpUdUfio F1b9CCTuzssqMBCuDcBUAcbGe6mwVfEB7Efb7w47ZxZNVK8APyelPOqAExFCGrdCcYPn YRgtypZSwL7vNScCB7JRiwtePdKyPT7xZkmOQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type:content-transfer-encoding; b=TeTlKG7OO0EKAv3SzZeIw1KYx40wfe8N8tfNSPUR3gNrGkeLD6QwQDuas7DZBFYqm5 oXlOXhFFPfx8xXdjGXFc2VFDlZQZwLkd8CY9LtoI8QSDYOc9gw97IbLgeSvtElJMGhro SD7SFq6SFSuuruFKCeCOPlqj3mXPhVz16iPwo= MIME-Version: 1.0 Received: by 10.216.85.212 with SMTP id u62mr2372840wee.164.1260192728961; Mon, 07 Dec 2009 05:32:08 -0800 (PST) In-Reply-To: References: From: Jonathan Ellis Date: Mon, 7 Dec 2009 07:31:48 -0600 Message-ID: Subject: Re: Cassandra nodes in multiple data centers To: cassandra-user@incubator.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Right. And ideally you want nodes to alternate DCs on the ring (first node by token in DC1, second in DC2, third in DC1, etc.) On Mon, Dec 7, 2009 at 5:06 AM, Sunil Khedar wrote: > Hi All, > From=A0Cassandra paper > "http://www.cs.cornell.edu/projects/ladis2009/papers/lakshman-ladis2009.p= df":=A0"Cassandra > is configured such that each row is replicated across multiple data > centers." > So, while using multiple data centers, is it required to have almost same > number of Cassandra nodes in each data center. If not, would it generate = key > hotspots? > > Thanks, > Sunil